CN1088462C - Method for the preparation of a material with a high water and salt solutions absorbency - Google Patents
Method for the preparation of a material with a high water and salt solutions absorbency Download PDFInfo
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- CN1088462C CN1088462C CN97192293A CN97192293A CN1088462C CN 1088462 C CN1088462 C CN 1088462C CN 97192293 A CN97192293 A CN 97192293A CN 97192293 A CN97192293 A CN 97192293A CN 1088462 C CN1088462 C CN 1088462C
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
- D01F2/02—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from solutions of cellulose in acids, bases or salts
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B1/00—Preparatory treatment of cellulose for making derivatives thereof, e.g. pre-treatment, pre-soaking, activation
- C08B1/003—Preparation of cellulose solutions, i.e. dopes, with different possible solvents, e.g. ionic liquids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B5/00—Preparation of cellulose esters of inorganic acids, e.g. phosphates
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Abstract
A process for preparing a material having a high water and salt solutions absorbency, the material containing mainly cellulose that is dissolved in a solvent containing phosphoric acid, a solution is obtained that contains 94-100 wt. % of the following constituents: cellulose, phosphoric acid and/or its anhydrides, and water, the solution is then coagulated and washed in a liquid containing less than 50 wt. % of water. This process can be used to obtain cellulose products, such as fibers or pulp, which have a high water and (isotonic) salt solutions absorbency.
Description
The present invention relates to high suction and inhale salts solution preparation methods, the main cellulose of said material.
High suction and suction (wait and ooze) salts solution material are also gained the name with super-absorbent.Super-absorbent is used in particular for personal hygiene prod, such as disposable diaper, tampon, sanitary towel and incontinence pad.The super-absorbent of fiber shape can be used for particularly in Moisture absorption cloth or the towel.
The super-absorbent of main cellulose is known among the WO 93/12275.The preparation based on cellulosic super-absorbent has been narrated in this patent application, mainly is based on the preparation of cellulosic fiber.It comprises that being spun into the fiber that the cellulose fiber peacekeeping will form in technology thereafter like this carries out chemical modification to form carboxymethyl cellulose (CMC) fiber.But the high suction of preparation and inhale the essential defect that the salts solution material has constituted this method in two different process steps (spinning fibre and carry out chemical modification with fiber).
The CMC of powder type knownly has the material of high-hygroscopicity and is particularly useful as thickening material.
US 3,658, and 790 also disclose a kind of preparation has high absorptive capacity to liquid the method based on cellulosic fiber.This method comprises several steps, such as with the saturated cellulosic fibre of water-bearing phosphate/urea solution (pulp form), dry at elevated temperatures and reaction with the product that obtains, with the pulp that obtains be scattered in the water, carrying out washing treatment, acid treatment, alkali lye are handled, carrying out washing treatment for the second time, and optionally the product that obtains are carried out machine finish.The moulding of the fiber that obtains can only be with other processing step.
Except these super-absorbent, the known super-absorbent that contains polyacrylic salt in addition.Shortcoming based on the superabsorbent material of polyacrylic salt is, and compares based on cellulose-based material, and their biodegradability is very poor.
Now shockingly found a kind of simple preparation method of super-absorbent of main cellulose.This method makes preparation high-hydroscopicity and the absorbefacient material of height (wait and ooze) salts solution become possibility, and this material is than based on polyacrylic material better biodegradability being arranged.
Present invention resides in the solvent that this paper begins in the described method Mierocrystalline cellulose to be dissolved in a phosphoric acid, obtain having the solution of the following component of 94-100wt%: Mierocrystalline cellulose; Phosphoric acid and/or its acid anhydride; Water, this solution solidifies in water content is lower than the liquid of 50wt% and washs.
Phosphoric acid one speech in the present patent application is meant all mineral acids of phosphorus and their mixture.Ortho-phosphoric acid is phosphoric acid, i.e. H
3PO
4Its anhydrous equivalent is that phosphoric anhydride is Vanadium Pentoxide in FLAKES (P
2O
5).Except that ortho-phosphoric acid and Vanadium Pentoxide in FLAKES, be decided by the water yield in this system, also have the phosphoric acid of a series of water binding abilities between Vanadium Pentoxide in FLAKES and ortho-phosphoric acid, such as Tripyrophosphoric acid (H
6P
4O
13, PPA).
The gross weight and the Total Water of the calculating of the weight percentage of Vanadium Pentoxide in FLAKES phosphoric acid (comprising its acid anhydride) from solvent begin in the solvent, and acid is transformed into Vanadium Pentoxide in FLAKES and water, calculate the percentage ratio of the gross weight of said Vanadium Pentoxide in FLAKES formation.In this describes, all be not included among the calculating of the Vanadium Pentoxide in FLAKES concentration in the solvent from Mierocrystalline cellulose or from the water of the material of the part of other component and the added water of obtain solution.
The gross weight of the calculating of the weight percentage of Vanadium Pentoxide in FLAKES phosphoric acid (comprising its acid anhydride) from solution and the total amount of water begin in the solution, change acid into Vanadium Pentoxide in FLAKES and water, and calculate the percentage ratio of the gross weight of said Vanadium Pentoxide in FLAKES formation.Because this reason, in this describes, all be included in from the water of the material of the part of Mierocrystalline cellulose or other component and water that obtain solution adds in the calculating of Vanadium Pentoxide in FLAKES concentration of solution.
Cellulosic weight percentage is that the gross weight of all components begins to calculate from solution in the solution.
Dewater, outside phosphoric acid and its acid anhydride and Mierocrystalline cellulose and/or phosphoric acid and the cellulosic reaction product, can have other material in the solution.
Therefore, the preparation of solution can mix and prepares being divided into following four groups component: Mierocrystalline cellulose; Water; The mineral acid of phosphorus (acid anhydride that comprises them); Other component." other component " can be the material that helps the cellulose solution processing characteristics, the solvent that differs from phosphoric acid or auxiliary (additive), for example stops the material of cellulose degradation or dyestuff etc. as far as possible.
Phosphorus bonded Mierocrystalline cellulose is also included within the component that constitutes solution 94-100wt%.In the situation of Mierocrystalline cellulose bonded phosphorus, the cellulose percentage ratio in the listed solution of this patent specification is relevant with the amount of calculating based on Mierocrystalline cellulose.The similar mode of this relation is applicable to the amount of the phosphorus described in this specification sheets.
The solution that is used for the inventive method can be as the applicant described in not disclosed in advance patent application WO96/06208 and obtain.Described in applying at this, the temperature and the acid concentration of discovery time, solution storage have very big influence to Mierocrystalline cellulose bonded phosphorus amount in the solution.The water-absorbent of also finding extrusion solution is decided by the amount of Mierocrystalline cellulose bonded phosphorus in the solution.
For obtained the highest may absorptive product, solution preferably contain greater than 1.5wt%, more especially greater than the Mierocrystalline cellulose of 3wt% in conjunction with phosphorus.Found that the whole bag of tricks influences Mierocrystalline cellulose bonded phosphorus content in the solution.The temperature that increases preparation/stock solution will increase its content.But Mierocrystalline cellulose also will speed up degraded at elevated temperatures.This degraded is reflected in the reduction of cellulosic degree of polymerization (DP).Find also that in addition Mierocrystalline cellulose can increase because of the increase of Vanadium Pentoxide in FLAKES concentration in the solvent in conjunction with the content of phosphorus, and this is very little to cellulosic degraded influence.
Mierocrystalline cellulose is dissolved at short notice and degrade little, the Vanadium Pentoxide in FLAKES of the preferably moisture and 65-85wt% of solvent, the Vanadium Pentoxide in FLAKES of more especially moisture and 70-80wt%.
Solution preferably contains the component of Mierocrystalline cellulose, phosphoric acid and/or its acid anhydride and the water of 96-100wt%.The amount of auxiliary or additive preferably only is 0-4wt%, calculates based on total solution weight.Yet more advantageously but solution contains the material of the component that differs from Mierocrystalline cellulose, phosphoric acid and/or its acid anhydride and water of minimum energy, promptly contains the additive of 0-1wt%.
In the methods of the invention, solution is to solidify in containing the liquid that is lower than 50wt% water and wash.Known when contacting with water, the solution that solidifies will swelling, this swelling sees it is not too desirable from the viewpoint of the further processing/processing of solidifying solution, so solution preferably solidifies in containing the liquid that is lower than 10wt% water and wash, and preferred liquid is anhydrous basically.In this application, when containing the water that is lower than 5wt%, be considered to anhydrous basically liquid.
For the product of producing a kind of like this form or outward appearance makes them be suitable as super-absorbent without any additional preparation process, preferably solidify preceding or process of setting in make solution that desired shape be arranged, solution is contacted, to obtain for example subparticle of fiber shape with peptizer; Or solution extruded in peptizer, to obtain depending on the extrudate that squeezes the mould shape, for example fiber, successive long filament or film.
The peptizer that is fit to can be selected from the mixture of low boil organic solvent or these solvents.The example of this suitable peptizer is alcohol, ketone and ester class, or their mixture.The preferred peptizer that uses is acetone, propyl alcohol or ethanol.If like this, then water can be added peptizer to obtain the peptizer that water content is lower than 50wt%.But preferred use is the peptizer that water content is lower than 10wt%, more especially anhydrous basically peptizer.
The washings that is fit to can be selected from the mixture of on the same group low boil organic solvent or these solvents.The example of such washings is alcohol, ketone and ester class or their mixture.The preferred washings that uses is an acetone or alcohol.If like this, then water can be added washings to obtain the washings that water content is lower than 50wt%.But preferred use is the washings that water content is lower than 10wt%, more especially anhydrous basically washings.Be to be used as peptizer and washings economically in the beneficial method with identical liquid.
Solution can be with the product neutralization that obtains after solidifying and washing.
Have found that, not only in the solution content of Mierocrystalline cellulose bonded phosphorus and therefore in the product that obtains the content of Mierocrystalline cellulose bonded phosphorus influential to the specific absorption of water or salts solution, and cellulosic DP is also influential to the specific absorption of water and salts solution in the product that obtains.In general, cellulosic DP is higher in the product will produce higher water or salts solution specific absorption (for the Mierocrystalline cellulose bonded phosphorus that same amount is arranged).
Mierocrystalline cellulose DP in the preferred product is greater than 200, particularly greater than 400, more especially greater than 750.
In applicant's not disclosed in advance patent application WO 96/06208, narrated a kind of method of producing fiber from the solution and the water of cellulose, phosphoric acid and/or its acid anhydride.This method combines with the inventive method and is particularly suitable for preparing water and/or the high fiber of salts solution specific absorption.In such method, spinning solution is to extrude by the spinning jet with one or more minor diameter orifices, and use water content to be lower than wt%, particularly to be lower than 10wt%, anhydrous basically peptizer and washings more especially, such as acetone or alcohol.And a kind of like this method makes the production with high-hydroscopicity and high strength fibre become possibility.
By the cellulose prods that the inventive method obtains, depend on that cellulose solution extrudes with the mode of solidifying many different shapes can be arranged, they have shown the fabulous liquid-absorbent such as water, (wait and ooze) salts solution and wet goods.These cellulose prods have also shown flame retardant resistance.In addition, these materials also can be used as ion-exchanger.Cellulose prods has good biological degradability and forms stability (compostability).
The example of such cellulose prods comprises: solution is extruded the fiber that obtains by the spinning jet with one or more minor diameter orifices; Solution is extruded the film that obtains by slit; Solution is contacted granular substance or the fibrous material that obtains with peptizer under vigorous stirring; Spinning solution is extruded by one or more major diameter orifices, will solidify then with the washing after product cut into particle or the fibrous material that fritter obtains.
Certainly these cellulose prods can also further be processed, and for example are made into the fabric of cellulosic fibre, cellulosic fibre is ground pulping, or make the cellulosic fibre nonwoven webs.Nonwoven webs can be lower than 50wt% with water content, preferred anhydrous basically liquid makes with the known wet shop of present technique art expert paper technology.
The superabsorbent cellulosic product that has that obtains can have the application of many aspects, for example is used for following application: individual health care disposable infant product-diaper
-the pants of learning to walk
Hygienic protection product-sanitary towel
-pantiliner
-tampon
The big cloth soil treatment of-incontinence diaper
Agricultural/horticultural is used-other the industrial overflow control processing of synthetic overcover cable insulation
Makeup
Medical absorption agent-wound dressing
-surgical procedure curtain
Drug delivery
Packing-objectionable impurities
-flowers and plant
-fruit vegetables storing
Food absorption pad-meat dish
Filtration medium
The disintegration of tablet medium
Cat litter (a kind ofly keeps clean cat
Dry substance)
Snowmaking
robotic activators
The sealing concrete blocks
Super absorb fiber or nonwoven fabric is particularly suitable for being used as: super absorption layer-be used for diaper
-health is with pad mist elimination fabric-be used for packing
-strainer
-moisture control system liquid or solid separates-is used for strainer
The big cloth of-pharmaceutical prod controlled release-soil separator
-the liquid that corrodes the controlling mechanism permeable gas hinders-is used to protects clothes
-strainer
The protection thermal absorption medium of-communication cable-be used for emergency heat barrier
-fire shelter
-method of cooling rag-as restaurant wiping towel
-aqueous industrial rag
-shop towel
-amusement circles rag (for example golf ball rag)
-graphic arts rag
-eyeglass cleaning cloth disposable medical articles for use, for example-be used for face shield
-operation shirt
-footwear guard shield
Arm sterilization dress ornament before the-operation
-operation case
-sterile package
-isolation shirt and patient's shirt
-compress and bandage
-sponge
-bed is with protecting goods like linen and incontinence patient bed clothes
In addition, super absorbing membrane can be used for learning to walk children's's training pant, super absorbing foams can be used for packing, and the super emulsification system that absorbs can be used for the water seal arrangement, for example is used for the insulation of cable.
The water soluble cellulose product that obtains can be used as: thickening material-be used for pigment (for example textile industry)
-makeup
-food
The mechanical strength of the warp sizing material paper chemical-improvement paper pulp of-coating fabric
-surperficial starching
-as the optical brightening agent carrier
-as tackiness agent
-as the stablizer of viscosity modifier dispersion system-be used for formulation for coating material
-formula of medicine field use-as tackifier
-as flotation agent
The fibrous cellulose product is suitable for using in weaving.The further advantage of these products is its bio-compatibilities, is pharmaceutically using so allow these products.The continuous cellulose long filament (utilizing WO 96/06028 described anisotropic solution) that obtains with the inventive method can be used as the strongthener in industrial application, for example strongthener of flexible pipe, travelling belt and doughnut.
Find further that already phosphorus content is can (part) water-soluble and be especially suitable for use as thickening material greater than 5.5% cellulose prods, for example as liquid, aqueous thickening material.Solubleness in water is decided by positively charged ion and the anion concentration in liquid, aqueous.Crosslinked cellulosic product can obtain phosphorus content greater than 5.5% and water-absorbent or inhale the very high non-dissolubility product of salts solution.
Crosslinked available different methods preparation, for example in the presence of the acid of phosphoric acid or carboxylic acid etc. with product by heating, or handle with two sense epoxide.Preferably handle, because the heating cellulose prods also can make the cellulosic backbone degraded of these products with two sense epoxide.Further find again, if these products are directly crosslinked after preparation, the fabulous product of the performance that just can be absorbed.
Method of the present invention can be used to produce freely absorbing greater than 10 gram/grams and freely absorbing greater than 5 gram/grams, freely absorbing greater than 20 gram/grams and the absorption in the salts solution cellulose prods greater than 10 gram/grams in water more especially in salts solution in water, for example fiber or pulp, in water freely absorb and freely absorbing by method shown in behind the application's literary composition in salts solution measured.The phosphorus content that obtains with method of the present invention greater than 6%, DP carries out crosslinkedly obtaining absorption in water greater than 100 gram/grams, particularly greater than 125 gram/grams with waiting the absorption of oozing in the salts solution (1wt% NaCl) greater than 20 gram/grams, particularly greater than the cellulose prods of 30 gram/grams greater than 300 fiber.
Find further that already the absorption of the cellulose prods that obtains with the inventive method is instantaneous.This is again an advantage that is better than the known absorbing agent that contains acrylate.These materials are approximately as long as just can finish absorption process in 2-3 minute.
Measuring method
The mensuration of phosphorus content
The content of Mierocrystalline cellulose bonded phosphorus can be measured with WO 96/06028 described method.
But the method that the phosphorus content of simpler mensuration cellulose prods is also arranged.Cellulose prods was carried out compressing tablet after under 50 ℃ vacuum drying about 15 hours for this reason, with x-ray fluorescence emmission spectrum meter (for example with the Philips PW 1400 of chromium pipe, spectral line: K α, 50 KV, 50 mA, GE crystal, angle: 141.025, gate time: 50 seconds) measures the x-ray fluorescence intensity of phosphorus in the compressing tablet.Proofread and correct spectrometer with the known compressing tablet of phosphorus content, the intensity that records is that the known short-cut method of available technology skilful person is transformed into the phosphorus content in the sample.
The mensuration that freely absorbs
Weighing 0.5 gram sample in the 100ml beaker, to wherein adding the desire absorbed liquid of its amount for the Z gram, for example distilled water, 1% NaCl solution or artificial urine, stir, (Weissband filter d=125mm) and by means of water-jet pump leaches liquid and collect with B after five minutes.The weight determination of the liquid of collecting is the X gram.Freely absorb (gram/gram)=(Z-X)/0.5.Another kind method is the water capacity that leaches thing with evaporation measurement, and the absorption in this method (gram/gram)=Y/0.5 leaches the loss (gram) of thing weight when wherein Y is for evaporation.
Absorption measurement under the pressure
Weighing 0.2 gram product in a beaker, to wherein adding the absorbed liquid of 25-50 gram desire, for example distilled water, 1% NaCl solution or artificial urine stir.After five minutes beaker content (part) is transferred in the filter crucible (porosity 0) of glass filter.Filter crucible places the centrifuge tube of 2cm bottom partition, and with such speed rotation 5 minutes, this speed can make it to produce 1000 times of power to gravity with pipe.The weight of weighing filter crucible content (=Wbe gram).At 140 ℃ of heat drying filter crucible contents, measure dried content heavy (=Wae gram) then.Absorption under the pressure (gram/gram)=(Wbe-Wae)/Wae.
In some absorption measurements, used artificial urine.The preparation of artificial urine be by Brian R.Shmaefsky in " How-to-do-it; artificial urine for laborary testing ", the biological teacher of the The American Biology Teacher[U.S.], Vol.52, No.3 (1990), method described in the 170-172.In the preparation of artificial urine, do not use creatinine and white protein.
The mensuration of DP
The mensuration of cellulosic degree of polymerization (DP) is with Wu Bieluodedai (Ubbelohde) 1 type (K=0.01).During mensuration desire surveyed in the Mierocrystalline cellulose sample and back under 50 ℃ in vacuum dry 16 hours, or proofread and correct water in the quadrol copper II/ water mixture to consider the water in the Mierocrystalline cellulose.The cellulose solution that has prepared 0.3wt% with this method with quadrol copper II/ water (1: 1) mixture.The measured in solution relative viscosity that this is obtained (Visc.rat or η rel), and press following formula by sticking relatively viscosity and measure limiting viscosity (η)
The cellulose concentration of C=solution (g/dl) in the formula
K=constant=0.25
It is as follows that formula is measured polymerization degree DP thus:
Or
Cellulosic DP carries out after following processing in the mensuration solution:
In Waring mixing tank (1 liter), contain 20 gram solution, add 400ml water, mixed 10 minutes with the highest setting speed then.The mixture that obtains is transferred on the screen cloth, and water thoroughly washs.Use 2% NaHCO at last
3In the solution and several minutes, water carries out after scouring again.Measure the DP of products obtained therefrom as mentioned above, from preparation quadrol copper II/ water/cellulose solution.
Referring now to the following examples illustrates the present invention.
Use following with the solution among the feedstock production embodiment of specification, except as otherwise noted.
| Raw material | Manufacturer and production number | P 2O 5Content (%) |
| P 2O 5 H 3PO 4 H 4P 2O 7 PPA * H 2O | J.T.Baker, 0193 La Fonte Electrique SA, Bex Suisse crystalline,＞99% (analyzes: Fluke Chemika 98.8%), 83210,97%, (analyze: Merck 98.8%), 85% min remove mineral substance | 98 71.2 78.8 84 - |
*The PPA=Tripyrophosphoric acid
Embodiment 1
(Viskokraft DP=700) is dissolved in and contains 79.6wt% P with 51.5 gram Solka-flocs under 16 ℃
2O
5Solvent in.Solvent mixes 74.1 gram ortho-phosphoric acid and 108.4 gram Tripyrophosphoric acid and mediates and obtained in 40 minutes under 46 ℃.After mixing 1.5 hours under 20 ℃, obtained containing the homogeneous solution of 3.5wt% Mierocrystalline cellulose bonded phosphorus.In a mixing tank with this solution solidifies and containing in the ethanol of 8.6wt% water and wash.Subsequently this material is filtered by B.This material is imported ethanol/water (7/3) mixture.In mixture, add 5% NaOH solution with this material that neutralizes.Material after the neutralization contains the phosphorus of 3.0wt%.After filtering with washing with alcohol with B, material drying 16 hours in 25 ℃ vacuum oven (200 millibars).
The water of products obtained therefrom (DP=500) freely is absorbed as 12.6 gram/grams, and salts solution freely is absorbed as 5.9 gram/grams.
The salts solution of Solka-floc of being untreated freely is absorbed as 1 gram/gram.
Embodiment 2
Under 12 ℃, restrain Alphacell with embodiment 1 described method with 18.8
(DP=2300) be dissolved in a solvent, this solvent mixes 68.9 gram ortho-phosphoric acid and 101.5 gram Tripyrophosphoric acid obtain.Mixing is after 6 hours down in 12 ℃ with mixture, and storage is 15 hours under 10 ℃.After this press embodiment 1 described method with solution solidifies, washing, filtration and neutralization.This material is phosphorous 5.3wt%, the phosphorous 4.0wt% in neutralization back before neutralization.The water of gained material (DP=1000) freely is absorbed as 23.8 gram/grams, salts solution and freely is absorbed as 13.6 gram/grams.
Embodiment 3
Under 20-30 ℃ 26.0 gram velveteens (DP=5900) are dissolved in a solvent 5 hours with embodiment 1 described method, solvent mixes 119.0 gram ortho-phosphoric acid and 175.7 gram Tripyrophosphoric acid obtain.Press embodiment 1 described method with solution solidifies, washing, filtration and neutralization.This material is phosphorous 4.5wt%, the phosphorous 3.5wt% in neutralization back before neutralization.The water of gained material (DP=1850) freely is absorbed as 30 gram/grams, salts solution and freely is absorbed as 8.5 gram/grams.
Embodiment 4
Under 20-35 ℃ 26.0 gram velveteens (DP=5900) were dissolved in a solvent more than 6 hours with embodiment 1 described method, solvent mixes 151.3 gram ortho-phosphoric acid and 228.0 gram Tripyrophosphoric acid obtain.Wash with solution solidifies and in the acetone mixture by embodiment 1 described method, filter then and neutralize.The material that obtains is phosphorous 11.9wt%, the phosphorous 7.4wt% in neutralization back before neutralization.The material that obtains (DP=280) can be water-soluble.
Embodiment 5
Mixing and heating ortho-phosphoric acid and Tripyrophosphoric acid are to prepare a solvent in the Linden kneading machine, and the ratio of ortho-phosphoric acid and Tripyrophosphoric acid should make the P of the solvent that obtains
2O
5Concentration is 74.4wt%.In this solvent, add Alphacell
Mierocrystalline cellulose (DP=2300).After Mierocrystalline cellulose dissolves fully, add other Tripyrophosphoric acid.Obtain containing 77.9wt% P through mixing with after mediating
2O
5Solution with 10.7wt% Mierocrystalline cellulose (DP=350-370).In experiment, certain reaction between Mierocrystalline cellulose and the phosphoric acid changes the content of Mierocrystalline cellulose bonded phosphorus and cellulosic DP.
Is that the spinning jet that 500 capillary bores are arranged of 65 μ m is extruded with these solution by diameter.The solution of extruding solidifies in acetone bath, also at room temperature makes its drying with washing with acetone under low-down tension force by an air gap.The solution-treated filamentary material of ethylene glycol diglycidylether in ethanol/water (70/30) mixture with 5wt% makes the material that obtains crosslinked.Select about 50 minutes reaction times of 5-to obtain the optimal absorption performance.After crosslinking Treatment, material is washed with ethanol or ethanol/water (70/30) mixture, and neutralize with the mixture of ethanol/water/alkali lye.
The absorptive character of the material that obtains like this under pressure are listed in the table 1.
Embodiment 6
In a twin screw extruder, prepared and contained 76.6wt% P
2O
5Solution with 12.0wt% Mierocrystalline cellulose (DP=240).By embodiment 5 described methods solution is extruded and with the fiber that obtains solidify, washing, crosslinked and the neutralization.The absorptive character of the material that obtains like this under pressure are listed in the table 1.
Table 1
| Embodiment | Phosphorus content (%) | The pH of material | Absorption in water (g/g) | Absorption (g/g) in 1wt% NaCl solution | Absorption in artificial urine (g/g) |
| 5a 5b 5c 6a 6b | 5.0 5.4 5.6 7.3 7.3 | 12 7 7 7 12 | 40 95 35 10 10 | 15 25 12 7 7 | 8 13 9 6 5 |
Embodiment 7
Prepared with embodiment 6 described methods and to have contained 76.6wt% P
2O
5With the cellulosic solution of 12.0wt%.This solution is extruded, solidifies, washed and drying to implement 5 described methods, obtained the fiber that DP=260 and phosphorus content are 10.5wt%.These fibers carry out crosslinked with embodiment 5 described crosslinking Treatment at 22 ℃.The material that obtains is neutralized to pH=7, and carries out drying in room temperature.
The solution examination that different cationic different concns are arranged has been surveyed the absorptive character of material under pressure.NaCl, MgSO have been used in the preparation of solution
4Or (CH
3COO)
2CaH
2O.Absorption under pressure (gram/gram) is shown in Table 2.
Table 2
| Cation concn (mol) | Na + | Mg 2+ | Ca 2+ |
| - 0.01 0.05 0.10 0.17(＝1wt％NaCl) 0.25 0.50 | 86 29 24 23 24 13 13 | 86 26 8 6 5 5 | 86 19 6 3 2 2 |
Embodiment 8
In a Linden kneading machine, use Alphacell
Mierocrystalline cellulose (DP=2300) has prepared and has contained 12wt% Mierocrystalline cellulose and 76.7wt% P
2O
5Solution.Solution is extruded, solidifies, washed and dry by embodiment 5 described methods, obtain DP=345 and phosphorus content and be 7.0% fiber.It is crosslinked to carry out fiber with embodiment 5 described crosslinking Treatment under 25 ℃, and the material that obtains is neutralized to pH=7 and at room temperature dry.Absorption under the pressure that the fiber that obtains like this shows is 125 gram/grams in water, is 30 gram/grams in 1wt% NaCl solution.
Embodiment 9
The fiber that has prepared DP=345 and phosphorus content 7.3% by embodiment 8 described methods.Under 22 ℃, carry out fiber crosslinked with embodiment 5 described crosslinking Treatment.Be absorbed as 172 gram/grams before the neutralization under the pressure of fiber in water.Carrying out absorption under the pressure of neutralizing treatment to the pH=12 with alkali lye, is 141 gram/grams in water, is 38 gram/grams in 1wt% NaCl solution.
Embodiment 10
Mixing and heating ortho-phosphoric acid and Tripyrophosphoric acid prepare the 18Kg solvent in a Linden kneading machine, and the ratio of ortho-phosphoric acid and Tripyrophosphoric acid should make it to obtain P
2O
5Concentration is the solvent of 74.3wt%.This solvent is cooled to 8 ℃, adds 3581 gram Alphacell
C 100 Mierocrystalline celluloses (DP=2300).Mierocrystalline cellulose dissolves back (kneading about 15 minutes) fully, adds Tripyrophosphoric acid in addition again and after mixing under 22 ℃ and kneading 25 minutes, obtains containing 75.4wt%P
2O
5With the cellulosic solution of 13.3wt%.
Solution is extruded by the spinning jet that 500 capillary bores are arranged of the about 65 μ m of diameter under 51 ℃.Extrusion solution is by the air gap of 45mm and solidify in acetone bath under 5 ℃.Several samples of the silvalin that obtains have been adopted in the experiment.Because certain reaction between fiber and the phosphoric acid is with content and cellulosic DP change to some extent in experiment of Mierocrystalline cellulose bonded phosphorus.
The sample that obtains is used washing with acetone under low-down tension force, and drying under reduced pressure at room temperature.Dried sample neutralizes with ethanol/water/alkali mixture.The DP of working sample before the neutralization.Content and the water under pressure with Mierocrystalline cellulose bonded phosphorus in the working sample of neutralization back absorb.It the results are shown in the table 3.
Table 3
| Embodiment | DP | Phosphorus content (wt%) | Absorption in water (g/g) |
| 10a 10b 10c 10d 10e | 827 760 751 747 733 | 1.2 1.9 1.8 1.9 2.3 | 15 56 50 42 83 |
Embodiment 11
In a twin screw extruder, prepared and contained 76.6wt% P
2O
5With 10.0wt% Mierocrystalline cellulose (Alphacell
C 100, solution DP=2300).Solution is extruded and the fiber that obtains solidified and use washing with acetone by embodiment 10 described methods.The silvalin that obtains is cut into the reeled yarn of long 25-40cm, uses washing with acetone again, at room temperature dry then.
The solution-treated of ethylene glycol diglycidylether in ethanol/water mixture (70/30) of reeled yarn usefulness 5wt% 42 minutes.After this crosslinking Treatment, with the washing with alcohol reeled yarn and be cut into the staple fibre of average long 6mm.
These staple fibres are scattered and be scattered in Lorentzen ﹠amp; In ethanol/water in the Wettre diverting device (95/5) mixture.The slurry that obtains is further disperseed and homogenizing in installing in flakes, until obtaining the slurry that solids content is 0.011wt%.Extract liquid with thin combination filtering net from slurry, obtain sheet material.Dry sheet material on cylinder, obtaining density is 31 gram/m
3The Mierocrystalline cellulose nonwoven sheet.The water of nonwoven sheet under pressure is absorbed as 95 gram/grams.The initial water of staple fibre under pressure is absorbed as 102 gram/grams.Mierocrystalline cellulose is 11.6wt% in conjunction with the content of phosphorus in the filamentary material before crosslinked, DP=242.
Claims (11)
1. one kind prepares the method that high-hydroscopicity is arranged and inhale the salts solution material, the main cellulose of said material, it is characterized in that Mierocrystalline cellulose is to be dissolved in the solvent of phosphoric acid, the Vanadium Pentoxide in FLAKES of this solvent comprises water and 65-85wt% wherein, resulting solution contains the following component of 94-100wt%: Mierocrystalline cellulose phosphoric acid and/or its acid anhydride; Water, this solution solidifies in water content is lower than the liquid of 50wt% and washs.
2. the method for claim 1 is characterized in that solution is to solidify and wash in water content is lower than the liquid of 5wt%.
3. the method for claim 1 is characterized in that the Vanadium Pentoxide in FLAKES of solvent comprises water and 70-80wt%.
4. the method for aforementioned each claim, it is characterized in that solution contain greater than 1.5wt% with Mierocrystalline cellulose bonded phosphorus.
5. the method for claim 4, it is characterized in that solution contain greater than 3wt% with Mierocrystalline cellulose bonded phosphorus.
6. a high suction and inhale the salts solution cellulose prods, this product is that the method with aforementioned each claim obtains, it is characterized in that product: water absorbs and is higher than 10 gram/grams, salts solution absorbs and is higher than 5 gram/grams, with product contain greater than 1.5wt% with Mierocrystalline cellulose bonded phosphorus, and the cellulosic polymerization degree of product is greater than 200.
7. the cellulose prods of claim 6, it is characterized in that product contain greater than 3wt% with Mierocrystalline cellulose bonded phosphorus.
8. claim 6 or 7 cellulose prods, it is characterized in that product: water absorbs and is higher than 20 gram/grams, and the salts solution absorption is higher than 10 gram/grams.
9. claim 6 or 7 cellulose prods is characterized in that the cellulosic polymerization degree in the product is greater than 400.
10. the cellulose prods of claim 8 is characterized in that the cellulosic polymerization degree in the product is greater than 400.
11. the cellulose prods of claim 9 is characterized in that the cellulosic polymerization degree in the product is greater than 750.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL1002335 | 1996-02-14 | ||
| NL1002335 | 1996-02-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1211257A CN1211257A (en) | 1999-03-17 |
| CN1088462C true CN1088462C (en) | 2002-07-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN97192293A Expired - Fee Related CN1088462C (en) | 1996-02-14 | 1997-02-12 | Method for the preparation of a material with a high water and salt solutions absorbency |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6027536A (en) |
| EP (1) | EP0880545A1 (en) |
| JP (1) | JP2000504767A (en) |
| CN (1) | CN1088462C (en) |
| WO (1) | WO1997030090A1 (en) |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1266455A (en) * | 1997-08-15 | 2000-09-13 | 阿克佐诺贝尔公司 | Use of phosphorylated cellulose in detergent compositions |
| DE19909653A1 (en) * | 1999-03-05 | 2000-09-07 | Stockhausen Chem Fab Gmbh | Powdery, crosslinked, aqueous liquids and blood-absorbing polymers, processes for their preparation and their use |
| NL1013658C2 (en) * | 1999-11-24 | 2001-05-28 | Akzo Nobel Nv | Hydrophobized polyols. |
| JP4430208B2 (en) * | 2000-06-29 | 2010-03-10 | ユニ・チャームペットケア株式会社 | Granular absorber for pets |
| US20080220441A1 (en) * | 2001-05-16 | 2008-09-11 | Birnbaum Eva R | Advanced drug development and manufacturing |
| US7169843B2 (en) | 2003-04-25 | 2007-01-30 | Stockhausen, Inc. | Superabsorbent polymer with high permeability |
| DE10334286B4 (en) * | 2003-07-25 | 2006-01-05 | Stockhausen Gmbh | Powdered, water-absorbing polymers with fine particles bound by means of thermoplastic adhesives, process for their preparation and chemical products and compounds containing them |
| US7173086B2 (en) * | 2003-10-31 | 2007-02-06 | Stockhausen, Inc. | Superabsorbent polymer with high permeability |
| DE102004029713B4 (en) * | 2004-06-21 | 2014-10-30 | Evonik Degussa Gmbh | Process for the preparation of a water-absorbing polysaccharide and its use |
| KR100863870B1 (en) | 2004-06-21 | 2008-10-15 | 에보닉 스톡하우젠 게엠베하 | Water absorbing polysaccharide and method for producing the same |
| US7812082B2 (en) * | 2005-12-12 | 2010-10-12 | Evonik Stockhausen, Llc | Thermoplastic coated superabsorbent polymer compositions |
| US20070135785A1 (en) * | 2005-12-12 | 2007-06-14 | Jian Qin | Absorbent articles comprising thermoplastic coated superabsorbent polymer materials |
| US8481618B2 (en) | 2008-07-03 | 2013-07-09 | Ricoh Company, Ltd. | Fire retardant resin composition |
| JP5423058B2 (en) * | 2008-07-03 | 2014-02-19 | 株式会社リコー | Flame retardant resin composition and molded body |
| US8361926B2 (en) | 2008-11-25 | 2013-01-29 | Evonik Stockhausen, Llc | Water-absorbing polysaccharide and method for producing the same |
| JP6076264B2 (en) * | 2011-02-01 | 2017-02-08 | オーストラリアン バイオリファイニング プロプライエタリー リミテッド | Cellulose phosphate powder product, process for producing the same, and use for removing contaminants from aqueous solutions |
| US9422641B2 (en) * | 2012-10-31 | 2016-08-23 | Kimberly-Clark Worldwide, Inc. | Filaments comprising microfibrillar cellulose, fibrous nonwoven webs and process for making the same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB263810A (en) * | 1925-12-30 | 1927-10-13 | British Celanese | Improvements in phosphoric acid solutions of cellulose |
| US3658790A (en) * | 1970-04-22 | 1972-04-25 | Kimberly Clark Co | Absorbent fiber products from phosphorylated cellulose fibers and process therefor |
| CN1055185A (en) * | 1990-03-24 | 1991-10-09 | 中国科学院广州化学研究所 | Water-absorption material produced by graft modification with cellulose initiated by potassium permanganate |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US429535A (en) * | 1890-06-03 | Achilles de khotinsky | ||
| DE1275503B (en) * | 1957-09-25 | 1968-08-22 | Benckiser Gmbh Joh A | Process to increase the skin tolerance and the absorbency of cellulose-containing fiber material |
| DE1185571B (en) * | 1959-03-07 | 1965-01-21 | Benckiser Gmbh Joh A | Process for finishing textiles made from natural or regenerated cellulose |
| DE1203725B (en) * | 1959-03-07 | 1965-10-28 | Benckiser Gmbh Joh A | Process for the filling and wrinkle-resistant finishing of textiles made of natural and regenerated cellulose |
| US3691154A (en) * | 1970-05-05 | 1972-09-12 | Kimberly Clark Co | Absorbent fibers of phosphorylated cellulose with ion exchange properties |
| GB9126193D0 (en) * | 1991-12-10 | 1992-02-12 | Courtaulds Plc | Cellulosic fibres |
| ATE180843T1 (en) * | 1994-08-19 | 1999-06-15 | Akzo Nobel Nv | CELLULOSE SOLUTIONS AND PRODUCTS MADE THEREOF |
-
1997
- 1997-02-12 WO PCT/EP1997/000652 patent/WO1997030090A1/en not_active Application Discontinuation
- 1997-02-12 JP JP9528985A patent/JP2000504767A/en active Pending
- 1997-02-12 EP EP97905015A patent/EP0880545A1/en not_active Withdrawn
- 1997-02-12 CN CN97192293A patent/CN1088462C/en not_active Expired - Fee Related
- 1997-02-12 US US09/117,876 patent/US6027536A/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB263810A (en) * | 1925-12-30 | 1927-10-13 | British Celanese | Improvements in phosphoric acid solutions of cellulose |
| US3658790A (en) * | 1970-04-22 | 1972-04-25 | Kimberly Clark Co | Absorbent fiber products from phosphorylated cellulose fibers and process therefor |
| CN1055185A (en) * | 1990-03-24 | 1991-10-09 | 中国科学院广州化学研究所 | Water-absorption material produced by graft modification with cellulose initiated by potassium permanganate |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0880545A1 (en) | 1998-12-02 |
| JP2000504767A (en) | 2000-04-18 |
| CN1211257A (en) | 1999-03-17 |
| WO1997030090A1 (en) | 1997-08-21 |
| US6027536A (en) | 2000-02-22 |
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